Cannot Find the Transport in STMS of SAND

Our user created a transport request and released the same from DEV, however, I cannot find the transport in STMS of SAND. Checked co-file/data directory and the transport is also not there. But, I can see that request is released in SE09(DEV). Only this particular request I cannot find in SAND. This is a serious error. Kindly, help me.

The request was locked, so I have unlocked the request through SE03. Now, the request got released from DEV but, cannot find in SAND. I have checked the datafile and cofile in DEV, the request is in COFILE but not in DATAFILE. It is a customizing request. Even the job RDDIMPD is running. What could be the reason? Please help me out.

Hello
If you are not able to see to the transport request at the OS level then I believe it was a local transport which is not transportable so no data/cofiles were generated.
The development class of the objects must have the transport layer which is associated with the transport route.
If there is no FROM and TO system defined then the request will be saved as a local change request.
To export an object it must be in a development class which belongs to a transportable transport layer.
The source system also need a destination system otherwise the request will be a local (independent of the transport layer).

FYI:
There are plenty of discussions about this here as well as on SDN.
Please find time to go through them

I'm still finding the reason. I have enough space for trans folder. There is To and Fro routes between DEV and SAND. Even after this they are requests flow. The request is in MODIFIABLE --> RELEASED.
In SE09, you can see, Transport and Repair button showing request status. In DEV system, under Transport button i can this request with error code '8' .

" The original objects was not over written.
A repaired object was not over written".

The solution now i have given is to create a new request with the objects required. I hope this is solution.